Data Sheet

AD9912

TABLE OF CONTENTS

analog.com

Rev. G | 2 of 38

Features................................................................ 1

Applications........................................................... 1

General Description...............................................1

Basic Block Diagram............................................. 1

Specifications........................................................ 3

DC Specifications............................................... 3

AC Specifications............................................... 4

Absolute Maximum Ratings...................................7

Thermal Resistance........................................... 7

ESD Caution.......................................................7

Pin Configuration and Function Descriptions........ 8

Typical Performance Characteristics................... 10

Input/Output Termination Recommendations...... 15

Theory of Operation.............................................16

Overview.......................................................... 16

Direct Digital Synthesizer (DDS)...................... 16

Digital-to-Analog (DAC) Output........................ 17

Reconstruction Filter........................................ 17

FDBK_IN Inputs............................................... 18

SYSCLK Inputs................................................ 18

Output Clock Drivers and 2× Frequency

Multiplier......................................................... 21

Harmonic Spur Reduction................................ 21

Thermal Performance..........................................23

Power-Up.............................................................24

Power-On Reset...............................................24

Default Output Frequency on Power-Up.......... 24

Power Supply Partitioning................................... 25

3.3 V Supplies.................................................. 25

1.8 V Supplies.................................................. 25

Serial Control Port............................................... 26

Serial Control Port Pin Descriptions................. 26

Operation of Serial Control Port....................... 26

The Instruction Word (16 Bits)..........................27

MSB/LSB First Transfers..................................27

I/O Register Map................................................. 30

I/O Register Descriptions.....................................32

Serial Port Configuration (Register 0x0000

to Register 0x0005)........................................ 32

Power-Down and Reset (Register 0x0010 to

Register 0x0013)............................................ 32

System Clock (Register 0x0020 to Register

0x0022).......................................................... 33

CMOS Output Divider (S-Divider) (Register

0x0100 to Register 0x0106)........................... 34

Frequency Tuning Word (Register 0x01A0

to Register 0x01AD)....................................... 34

Doubler and Output Drivers (Register

0x0200 to Register 0x0201)........................... 36

Calibration (User-Accessible Trim) (Register

0x0400 to Register 0x0410)........................... 36

Harmonic Spur Reduction (Register 0x0500

to Register 0x0509)........................................ 36

Outline Dimensions............................................. 38

Ordering Guide.................................................38

Evaluation Boards............................................ 38

REVISION HISTORY

7/2023—Rev. F to Rev. G

Changes to Figure 2........................................................................................................................................ 8

Change to Table 12........................................................................................................................................30

Updated Outline Dimensions......................................................................................................................... 38